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NEET levelSingle correct optionDifficulty 1 of 3sb117

Which of the following alkali metal carbonates decomposes on moderate heating?

A $Li X_{2} CO X_{3}$
B $Na X_{2} CO X_{3}$
C $K X_{2} CO X_{3}$
D $Cs X_{2} CO X_{3}$

Answer: A

Only

Li X_{2} CO X_{3}

decomposes easily:

Li X_{2} CO X_{3} Li X_{2} O + CO X_{2}

. The small

Li X^{+}

polarises the carbonate ion strongly and gives a stable oxide with high lattice energy. The other carbonates are stable to heat.

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